Mercurial > hg > orthanc-stone
diff Framework/Scene2D/Internals/CairoLookupTableTextureRenderer.cpp @ 768:55411e7da2f7
LookupTableTextureSceneLayer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 23 May 2019 20:04:33 +0200 |
parents | |
children | 6e888cf6a48b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Scene2D/Internals/CairoLookupTableTextureRenderer.cpp Thu May 23 20:04:33 2019 +0200 @@ -0,0 +1,108 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "CairoLookupTableTextureRenderer.h" + +#include "CairoColorTextureRenderer.h" +#include "../LookupTableTextureSceneLayer.h" + +#include <Core/OrthancException.h> + +namespace OrthancStone +{ + namespace Internals + { + void CairoLookupTableTextureRenderer::Update(const ISceneLayer& layer) + { + const LookupTableTextureSceneLayer& l = dynamic_cast<const LookupTableTextureSceneLayer&>(layer); + + textureTransform_ = l.GetTransform(); + isLinearInterpolation_ = l.IsLinearInterpolation(); + + const float a = l.GetMinValue(); + float slope; + + if (l.GetMinValue() >= l.GetMaxValue()) + { + slope = 0; + } + else + { + slope = 256.0f / (l.GetMaxValue() - l.GetMinValue()); + } + + const Orthanc::ImageAccessor& source = l.GetTexture(); + const unsigned int width = source.GetWidth(); + const unsigned int height = source.GetHeight(); + texture_.SetSize(width, height, true /* alpha channel is enabled */); + + Orthanc::ImageAccessor target; + texture_.GetWriteableAccessor(target); + + const std::vector<uint8_t>& lut = l.GetLookupTable(); + if (lut.size() != 4 * 256) + { + throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); + } + + assert(source.GetFormat() == Orthanc::PixelFormat_Float32 && + target.GetFormat() == Orthanc::PixelFormat_BGRA32 && + sizeof(float) == 4); + + for (unsigned int y = 0; y < height; y++) + { + const float* p = reinterpret_cast<const float*>(source.GetConstRow(y)); + uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y)); + + for (unsigned int x = 0; x < width; x++) + { + float v = (*p - a) * slope; + if (v <= 0) + { + v = 0; + } + else if (v >= 255) + { + v = 255; + } + + uint8_t vv = static_cast<uint8_t>(v); + + q[0] = lut[4 * vv + 2]; // B + q[1] = lut[4 * vv + 1]; // G + q[2] = lut[4 * vv + 0]; // R + q[3] = lut[4 * vv + 3]; // A + + p++; + q += 4; + } + } + + cairo_surface_mark_dirty(texture_.GetObject()); + } + + void CairoLookupTableTextureRenderer::Render(const AffineTransform2D& transform) + { + CairoColorTextureRenderer::RenderColorTexture(target_, transform, texture_, + textureTransform_, isLinearInterpolation_); + } + } +}